The infrared (IR) LED finds applications in Burglar-Alarm systems and other areas requiring invisible radiation. Generally, the infrared emitting LEDs are connected with phosphor so that, by the excitation of phosphor, visible light can be produced.

The advantages of using LEDs in electronic displays are.

1). LEDs are very small and can be considered as point sources of light.

They can, therefore, be stacked in a high density matnx to serve as a numeric and Alphanumeric Display

2) The light output from an LED is a function of Current flowing through it. An LED can. therefore, be controlled smoothly by varying the current.

This is particularly useful for operating LED displays under different ambient lighting conditions.

4) LEDs are very fast devices, having a turn-on/off time of less than 1 ms.

5) The low Supply Voltage and current requirements of leds make them compatible with TTL ics.

6. LEDs are manufactured with the same type of technology as that used for Transistors and ICs and, therefore, they are economical and have a high degree of reliability

7) LEDs are rugged and can, therefore, withstand shocks and vibrations.They can be operated over a wide range of temperature say, 0-70degree C.

The disadvantage of LEDs compared to LCDs is their High Power requirement.

Also, LEDs are not suited for large area displays, primarily because of their high cost.Question Related to This Article :What is the possible range of current limiting resistor essential for lightening the LED in certain applications after pressing the push-button?Ans: 220- 330 ΩMay You Like To Read This Related Knowledgeable Articles ::